Environmental factors which studies have shown that may be in relation with myopia are: near work (19, 20), stature (21, 22), night time light exposure (10) [however this relationship was not confirmed neither in American (20) and English children and nor in Indian monkeys (23, 24)], day time light exposure (25), refined sugar consumption [It has been shown that carbohydrate consumption can stimulate a series of events which lead to eye's axial length increase and consequently myopia. So refined sugar consumption which has been increased nowadays may play a role.] (26), IQ (Intelligence quotient) (27-33), birth weight, social and economic condition (7), physical activity (32), and breastfeeding (7).